Sec. 4.6-4.7 Quiz

Solve by factoring: x² - 9x + 20 = 0

• x = -4 and x = -5

• x = 20 and x = -9

• x = 4 and x = 5

• x = -4 and x = 5

• No Real Solution

What should you do first in solving this equation?
x² + 6x - 13 = 3

• Get factored form
• Find two numbers which add to make 6 and multiply to make -13
• Make it equal 0 by subtracting 3 on each side
• Type it all in a calculator.

• √12
• 12
• 72
• √72

• 100
• √20
• 10√2
• 2√10

• -15√2
• -6√5
• -150
• 15√2

• A
• B
• C
• D

Solve by taking the square root:

4x² = 100

• ±10

• ±25

• ±5

• 5